import {
  document,
	window,
	HTMLCanvasElement,
	requestAnimationFrame,
	cancelAnimationFrame,
core,
	Event,
  Event0
} from "dhtml-weixin"
import * as THREE from './three/Three';

import Stats from 'three/addons/libs/stats.module.js';
//import { GPUStatsPanel } from 'three/addons/utils/GPUStatsPanel.js';

import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
import { OrbitControls0 } from 'three/addons/controls/OrbitControls0.js';
import { Line2 } from 'three/addons/lines/Line2.js';
import { LineMaterial } from 'three/addons/lines/LineMaterial.js';
import { LineGeometry } from 'three/addons/lines/LineGeometry.js';
import * as GeometryUtils from 'three/addons/utils/GeometryUtils.js';
var requestId
Page({
  onShareAppMessage(){
    return getApp().onShare()
  },
  onShareTimeline(){
     return {title:"ThreeX 2.0"}
  },
	onUnload() {
		cancelAnimationFrame(requestId, this.canvas)
		this.worker && this.worker.terminate()
if(this.canvas) this.canvas = null
		setTimeout(() => {
			if (this.renderer instanceof THREE.WebGLRenderer) {
				this.renderer.dispose()
				this.renderer.forceContextLoss()
				this.renderer.context = null
				this.renderer.domElement = null
				this.renderer = null
			}
		}, 0)
	},
  webgl_touch(e){
		const web_e = (window.platform=="devtools"?Event:Event0).fix(e)
		this.canvas.dispatchEvent(web_e)
  },
  onLoad() {
		document.createElementAsync("canvas", "webgl2").then(canvas => {
      this.canvas = canvas
      this.body_load(canvas).then()
    })
  },
  async body_load(canvas3d) {

    let line, renderer, scene, camera, camera2, controls;
    let line1;
    let matLine, matLineBasic, matLineDashed;
    let stats, gpuPanel;
    let gui;

    // viewport
    let insetWidth;
    let insetHeight;

    init();
    animate();

    function init() {

      renderer = new THREE.WebGLRenderer( { antialias: true } );
      renderer.setPixelRatio( window.devicePixelRatio );
      renderer.setClearColor( 0x000000, 0.0 );
      renderer.setSize( window.innerWidth, window.innerHeight );
      document.body.appendChild( renderer.domElement );

      scene = new THREE.Scene();

      camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 1000 );
      camera.position.set( - 40, 0, 60 );

      camera2 = new THREE.PerspectiveCamera( 40, 1, 1, 1000 );
      camera2.position.copy( camera.position );

      controls = new (window.platform=="devtools"?OrbitControls:OrbitControls0)( camera, renderer.domElement );
      controls.minDistance = 10;
      controls.maxDistance = 500;


      // Position and THREE.Color Data

      const positions = [];
      const colors = [];

      const points = GeometryUtils.hilbert3D( new THREE.Vector3( 0, 0, 0 ), 20.0, 1, 0, 1, 2, 3, 4, 5, 6, 7 );

      const spline = new THREE.CatmullRomCurve3( points );
      const divisions = Math.round( 12 * points.length );
      const point = new THREE.Vector3();
      const color = new THREE.Color();

      for ( let i = 0, l = divisions; i < l; i ++ ) {

        const t = i / l;

        spline.getPoint( t, point );
        positions.push( point.x, point.y, point.z );

        color.setHSL( t, 1.0, 0.5, THREE.SRGBColorSpace );
        colors.push( color.r, color.g, color.b );

      }


      // Line2 ( LineGeometry, LineMaterial )

      const geometry = new LineGeometry();
      geometry.setPositions( positions );
      geometry.setColors( colors );

      matLine = new LineMaterial( {

        color: 0xffffff,
        linewidth: 5, // in world units with size attenuation, pixels otherwise
        vertexColors: true,

        //resolution:  // to be set by renderer, eventually
        dashed: false,
        alphaToCoverage: true,

      } );

      line = new Line2( geometry, matLine );
      line.computeLineDistances();
      line.scale.set( 1, 1, 1 );
      scene.add( line );


      // THREE.Line ( THREE.BufferGeometry, THREE.LineBasicMaterial ) - rendered with gl.LINE_STRIP

      const geo = new THREE.BufferGeometry();
      geo.setAttribute( 'position', new THREE.Float32BufferAttribute( positions, 3 ) );
      geo.setAttribute( 'color', new THREE.Float32BufferAttribute( colors, 3 ) );

      matLineBasic = new THREE.LineBasicMaterial( { vertexColors: true } );
      matLineDashed = new THREE.LineDashedMaterial( { vertexColors: true, scale: 2, dashSize: 1, gapSize: 1 } );

      line1 = new THREE.Line( geo, matLineBasic );
      line1.computeLineDistances();
      line1.visible = false;
      scene.add( line1 );

      //

      window.addEventListener( 'resize', onWindowResize );
      onWindowResize();

      stats = new Stats();
      document.body.appendChild( stats.dom );

      //gpuPanel = new GPUStatsPanel( renderer.getContext() );
      //stats.addPanel( gpuPanel );
      stats.showPanel( 0 );

      initGui();

    }

    function onWindowResize() {

      camera.aspect = window.innerWidth / window.innerHeight;
      camera.updateProjectionMatrix();

      renderer.setSize( window.innerWidth, window.innerHeight );

      insetWidth = window.innerHeight / 4; // square
      insetHeight = window.innerHeight / 4;

      camera2.aspect = insetWidth / insetHeight;
      camera2.updateProjectionMatrix();

    }

    function animate() {

      requestId = requestAnimationFrame( animate );

      stats.update();

      // main scene

      renderer.setClearColor( 0x000000, 0 );

      renderer.setViewport( 0, 0, window.innerWidth, window.innerHeight );

      // renderer will set this eventually
      matLine.resolution.set( window.innerWidth, window.innerHeight ); // resolution of the viewport

      //gpuPanel.startQuery();
      renderer.render( scene, camera );
      //gpuPanel.endQuery();

      // inset scene

      renderer.setClearColor( 0x222222, 1 );

      renderer.clearDepth(); // important!

      renderer.setScissorTest( true );

      renderer.setScissor( 20, 20, insetWidth, insetHeight );

      renderer.setViewport( 20, 20, insetWidth, insetHeight );

      camera2.position.copy( camera.position );
      camera2.quaternion.copy( camera.quaternion );

      // renderer will set this eventually
      matLine.resolution.set( insetWidth, insetHeight ); // resolution of the inset viewport

      renderer.render( scene, camera2 );

      renderer.setScissorTest( false );

    }

    //

    function initGui() {

      gui = new GUI();

      const param = {
        'line type': 0,
        'world units': false,
        'width': 5,
        'alphaToCoverage': true,
        'dashed': false,
        'dash scale': 1,
        'dash / gap': 1
      };

      gui.add( param, 'line type', { 'LineGeometry': 0, 'gl.LINE': 1 } ).onChange( function ( val ) {

        switch ( val ) {

          case 0:
            line.visible = true;

            line1.visible = false;

            break;

          case 1:
            line.visible = false;

            line1.visible = true;

            break;

        }

      } );

      gui.add( param, 'world units' ).onChange( function ( val ) {

        matLine.worldUnits = val;
        matLine.needsUpdate = true;

      } );

      gui.add( param, 'width', 1, 10 ).onChange( function ( val ) {

        matLine.linewidth = val;

      } );

      gui.add( param, 'alphaToCoverage' ).onChange( function ( val ) {

        matLine.alphaToCoverage = val;

      } );

      gui.add( param, 'dashed' ).onChange( function ( val ) {

        matLine.dashed = val;
        line1.material = val ? matLineDashed : matLineBasic;

      } );

      gui.add( param, 'dash scale', 0.5, 2, 0.1 ).onChange( function ( val ) {

        matLine.dashScale = val;
        matLineDashed.scale = val;

      } );

      gui.add( param, 'dash / gap', { '2 : 1': 0, '1 : 1': 1, '1 : 2': 2 } ).onChange( function ( val ) {

        switch ( val ) {

          case 0:
            matLine.dashSize = 2;
            matLine.gapSize = 1;

            matLineDashed.dashSize = 2;
            matLineDashed.gapSize = 1;

            break;

          case 1:
            matLine.dashSize = 1;
            matLine.gapSize = 1;

            matLineDashed.dashSize = 1;
            matLineDashed.gapSize = 1;

            break;

          case 2:
            matLine.dashSize = 1;
            matLine.gapSize = 2;

            matLineDashed.dashSize = 1;
            matLineDashed.gapSize = 2;

            break;

        }

      } );

    }
  }
})